The Blue Snowball Nebula in Andromeda

Uploaded 11/3/2001

NGC7662 with 2x barlow

Small and bright, this seldom photographed object above was photographed during full moon, solid evidence that productive astrophotography doesn't have to stop during this period. This object is only 17 seconds of arc in size, but is a brilliant 9.2 magnitude in brightness. I had to image this object using a 2x Televue Big Barlow, to double my focal length, and therefore was shooting my 12.5 inch scope at f/10. Finding a nearby guidestar bright enough for the RGB frames was impossible in my case, and I backed off to prime focus and a binning of 1x1 for the color frames. you can see the difference putting a barlow in the system does for you by comparing the above image with this image below, the prime focus shot both binned 1x1.

Prime focus image

Instrument:  12.5" f/5 Home made Newtonian
Platform:  Astrophysics 1200 QMD
CCD Camera:  SBIG ST7E w/Enhanced Cooling
Exposure:  LRGB = 30:10:10:10 
Filters:  RGB Tricolor
Location:  Payson, Arizona
Elevation:  5150 ft.
Sky:  Seeing FMHW = 2.0 arcsec, Transparency 8/10, Full Moon in Sky
Outside Temperature:  15 C
CCD Temperature:  -25 C
Processing:  Maxim DL, Photoshop, PW Pro.




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